Pressure-Shift of the (0,0) and (1,0) Bands of the Oxygen[formula]Transition from Fourier Transform Spectroscopy

✍ Scribed by Alexander J. Phillips; Peter A. Hamilton

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 109 KB
• Volume: 174
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.0025

✦ Synopsis

The pressure shifts of the (0,0) and (1,0) bands of the b 1 S / g -X 3 S 0 g transition of oxygen (the so-called A and B bands) have been measured at room temperature in pure oxygen and in nitrogen using high-resolution Fourier transform spectroscopy. The average self-shift in the (1,0) band is 00.014 cm 01 atm 01 , which is only slightly larger than the average self-shift in the (0,0) band of 00.011 cm 01 atm 01 . In both cases the shift is to lower wavenumber with increasing pressure. The shift in the (0,0) band due to increasing pressure of N 2 is significantly larger with a rotationally averaged value of 00.018 cm 01 atm 01 . The rotational dependence of the pressure shift has been measured in all cases and shows an increase in the shift of up to 50% with increasing N, with most of the change occurring at low N. The magnitude of these shifts is significant relative to the accuracy with which the absolute line positions have been measured and indicates that correction for pressure is required if these lines are to be used as reference lines in the atmosphere.